- New app menu
- Preferences in a tab
- "Full color support"
- Better dark theme
- Attachment management
- "Filelink improved"
I've been using Thunderbird for a few years now and I still feel like it's just not as good intuitive as for example Apple Mail. You need addons to have proper threading support, it looks so ugly on anything but Linux (as it's a GTK app so you can change it), Exchange support is lackluster (I get constant disconnect messages even though it's fine just minutes later), and just generally using it is not convenient which I cannot even begin to describe.
I'd love to pay for Thunderbird if it makes for a proper development cycle with fresh updates that are actually useful.